The Solid State

  • Question 73
    CBSEENCH12005421

    What are non-stoichiometric compounds?

    Solution
    Non-stoichiometric compounds are chemical compounds, almost always solid inorganic compounds, having elemental composition whose proportions cannot be represented by integers; most often, in such materials, some small percentage of atoms are missing or too many atoms are packed into an otherwise perfect lattice work. exaple FeO, ZnO etc.
    Question 74
    CBSEENCH12005422

    In which compound  Schottky and Frenkel defects are present together?

    Solution
    Silver bromide (AgBr) has both Schottky and Frenkel defects together.
    Question 75
    CBSEENCH12005423

    What is the percentage of free space in a body centred cubic crystal?

    Solution
    In body centred cubic crystal packing effciency is 68% thus free space in body centred cubic crystal is free space effciency = 100- 68%
                                  = 32%
    Question 76
    CBSEENCH12005424

    Give one example of anti ferroelectric solid and one example of ferroelectric solid.

    Solution
    Antiferro electric solid-PbZrO3 (Lead Zirconate).
    Ferro electric solid-BaTiO3 (Barium Titanate).

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